Double-zigzag sewing-machine.



No. 710,696. Patented Oct. 7, 1902 H. A. KLEMM.

DOUBLE ZIGZAG SEWING MACHINE.

[Applimtion filed Oct. 31, M501.

3 Shegts-Sheet I.

(No Model.)

!NVENTOR\ W BY E ATTORN Y m: hQRRY PETERS co. FHQYG-UTHO, WASHINGTON. w. c

' No. 7m,s9e. atented Oct. 7, I902. H. A. KLEMM.

DOUBLE ZIGZAG SEWING MACHINE.

(Application filed Oct. 31, 1901.)

3 Sheets-Sheet 2.

(No Model.)

INVENTOR ATTORNEY h WiTNESSES:

ZdfM

N0. 7l0,696. Patented Oct. 7, I902.

H. A. KLEMM. DOUBLE ZIGZAG SEWING MACHINE.

I (Application filed. Oct. 31, 1901.)

3 Sheets-Sheet 3.

(No Model.)

I .lIl/llllllll INVENTOR WITNESSES UNTTED STATES PATENT OFFICE.

HERMANN A. KLEMM, OF NEXV YORK, N. Y., ASSIGNOR TO SOPHIE I-IESSEL, OF SHELDON, CONNECTICUT, AND AMELIA HESSEL, OF NIUV YORK, N. Y.

DOUBLE-ZIGZAG SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 710,696, dated October '7, 1902.

Application filed October 81, 1901. Serial No. 80,638. (No model.) i

To rtZZ w/tom it ntay concern.-

Be it known that I, HERMANN A. KLEMM, a citizen of the United States of America, and a resident of New York city, county and State of New York, have invented certain new and useful Improvements in Double-Zigzag Sewing-Machines, of which the following is a specification.

This invention consists of improvements in the needle-operating mechanism and the looper-operating mechanism of double-zigzag sewing-machines of the character represented in the Letters Patent No. 686,662, granted to me November 12, 1901, whereby it is designed to provide more reliable construction and easier and smoother running for producing the same kind of work as is accomplished by the apparatus of the said prior application and which is therein described as follows:

On the upper surface of the fabric two parallel rows of stitches are formed at a suitable distance apart with diagonal or zigzag threads of each extending from one to the other of the parallel rows, so as to form a double-zigzag scam, in which the diagonal threads cross each other at the middle line between the two rows of stitches, the arrangement being such that exchange of the needles is effected without turning the needles,whereby the relations of the needles to the looping devices are unchanged and a single looper working in the plane of the two needles may bind off the loops of both needles.

The general arrangement in this and said prior case comprises, essentially, a couple of needles mounted on vertical reciprocating needle-bars, respectively, and placed in a line at right angles to the feed-line, with means for causing them to exchange places with each other at each operation for laying the diagonal threads extending from one line of stitches to the other and so that they thus cross each other, the improved apparatus being in the present case arranged in a machine of common construction as to the main parts, whereof various types of machines may be used.

In the accompanying drawings, representing my present improvements, Figure l is mainly a front side elevation, but with some parts in vertical section. Fig. 2 is a plan view. Fig. 3 is a detail of the looper mechanism in a plan view inverted. Fig. 4 is a detail in horizontal section on line td of Fig. 1. Fig. 5 is an elevation as seen looking from the left-hand side of the machine with the work-plate in vertical section along the feedline. Fig. 6 is an elevation of parts as seen in the same view as that of Fig. 5.

The needles are represented at a and Z), respectively. They are mounted side by side in a line at right angles to the feed-line on the respective needle-bars c and (Z, to which they are attached by lateral arms 6 f, nearly meeting midway between the needle bars when in the exchange of places by the needles they are most distant from each other, said arms being notched sidewise between the needles and the bars, so that when overlapping each other, as represented in Fig. 4, they will intermesh and carry the needles in the plane of the centers of the two needle-bars.

The needle-bar c is mounted in a frame g, pivoted at one side in a vertical axis at h to swing in the manner of a gate on the front of the head of the stationary supporting-arm Z of the machine, and said gate is at its other side connected by a rod j with a rocking arm is, carried on a pivot Z, supported on the stationary arm, to swing said needle-bar c toward and from needle-bar d. The needle-bar d is mounted in a similarly-swinging gate m, which is pivoted at n in the ends of arms 0 of the vertical shaft 19, for swinging in like manner as gate g swings, the pivots of the said gates being respectively on opposite sides of the head of the supporting-arm 'Z. The gate m is in like manner connected by a rod 5 to a rocking arm q, carried on the pivot Z, to swing said needle-bar cZ toward and from the other needle-bar. The arms is and q are arranged on opposite sides of axis Z, so that the needle-bars simultaneously approach and recede from each other, respectively. 7

The rodsj and s are adjustable along the rocking arms 7c and q to vary the range of the swinging movements of the needle bars. Motion is imparted to these rocking arms by stud t of arm q working in a cam-groove 2b of a disk *0, carried on a short shaft to, which is geared by the bevel-wheels a; with the main shaft 3 the motion of the shaft to and disk '0 being one revolution to two of the shaft y for making only one lateral movement of the needles to each complete cycle of the rest of the machine.

The needle-bar-carrying frame m is pivoted in the arms of the vertical shaft 19 for separating the intermeshing notched needle-carrying arms 6 and f for clearing each other preparatory to their interchanging movements and for restoring their proper' relations preparatory to beginning the stitches. (See Fig. 4, in which the dotted line indicates this movement of bar d and arm f.) For so operating needle-bar (1 its frame m is connected by a link '1' with a lever z, pivoted at 2 and having a stud 3, engaging a camgroove i in a disk 5, carried on a vertical shaft 6, geared with the main shaft y by the bevel-wheels 7. The needle-bar d and its carrying-frame thus have a swinging motion on shaft p instead of the sliding motion in ways, as in the prior case, which is a better and easier motion, simpler and cheaper to construct, and more reliable in operation.

The needle-bar d is coupled by link 8 with a wrist-pin 9 of the disk 10, carried by the main shaft y, for operating said bar vertically, and said needle-bar cl carries prongs 11,which embrace a grooved collar 12 on needle-bar c for communicating vertical motion to it from the main shaft through needle-bar d. This pronged and grooved collar connection of the two needle-bars avoids the lateral stress on the frame carrying needle-bar d, as in the apparatus of the said prior application, wherein the frame slides along the arm by which motion is communicated from one needle-bar to the other, while in this case the prongs are permanently connected on bar (Z, and the space between the prongs where they embrace the collar 12 is sufficient to allow the lateral movement of bar (1 without conflict with the hub, while the radial breadth of the flanges includes the whole lateral range of the prongs, so that they both take eifectin thrusting the needle-bar in the direct line of its movements, and thus avoid lateral thrusts, which occur with additional friction when the needlebar-Workin g thrusts are applied out of the line of the needle-bar.

The usual looping-hook 13 is employed for inserting theunder thread, said hook being arranged to work transversely of the feed movement and secure the loops of both lines of stitches. It is pivoted on the laterallyrocking head 14, by which it has the usual lateral movement for opening the needlethread loops for the needles to insert the new loops, said head ll being carried on the rocking shaft 15, which is operated by a stud 16 of an arm 17 of said shaft engaging a camgroove 18 in a hub 10, carried on the vertical shaft 6, by which the shifting movements of the needle-bars are effected, said shaft being extended through the upright part 19 of the supporting-arm z and below the Work-plate 20 for this purpose and also for operating the loopcr for inserting the binding-thread loops, for which it carries an eccentric 21 above the hub 19, by which reciprocating motion is communicated to the rod 22. Instead of connecting this rod directly to an arm of the hook-hub, as it is commonly connected, I connect it to one extremity of a bell-crank 23, pivoted at 24 and connect the other extremity of said bell-crank to a short arm 24 of the hook-pivot by a link 25. The bell-crank is pivoted on a block 26, that is carried on the rock-shaft 15 in unison with the rocking head 14, which carries the hook-pivot.

It will be seen that the arm of the bell-crank connected to the link 25 is longer than the other arm of said bell-crank and also longer than the arm of the hook-pivot to which said link is connected, whereby the throw of the eccentric may be less for a given movement of the hook than would otherwise be required, thus enabling smaller dimensions of the eccentric, which is desirable; but the essential feature of this arm-and-link connection is to accelerate both the forward movements of the book through the loops and the retiring movements therefrom, which will appear by noting that the bell-crank operates in the quickest part of its movement the link 25 and the link in the quickest part of its movement operates the hook-pivot, which materially quickens the forward and backward movements of the hook in addition to the quickness of such movements due to the eccentric 21 being set, as usual, to accelerate these movements when the rod 22 is connected in the usual manner to a radial arm of the hook-pivot; but in this case such quick action of the eccentric is further quickened, which is important in avoiding skipping of the loops, particularly in the use of one hook for binding the needleloop of two seams at a distance apart. It is obvious that various modifications of these crank-and-link devices may be employed for thus accelerating the movements of the hook, and I do not limit myself to the particular arrangement shown. The pivot of the hooksupporting stafi 27 is set directly under the center point between the needle, so that the point of the hook swings close under the throat-plate on the forward movement, and thus more certainly enters the needle-thread loops.

The feed-dog is represented in part at 28, and 29 indicates part of a lever for operating the said feed-dog; but these form no part of the invention claimed and need not be further described.

\Vhile I have only representeda flat-bed (so called) machine in this example of my invention, it is obvious that my improvements are alike applicable to cylinder or horn machines, and I include such machines as Within the scope of my invention.

What I claim as my invention is 1. In a sewing-machine, the combination of needle-operating and feed-operating mechanisms, two needles located in a line transversely of the feed-line, means to cause said needles to automatically exchange places with each other while in the operation of sewing without turning the needles, consisting of a support for one of said needles carried on pivoted arms to operate said needles in exchanging places, and on which arms said support is also pivoted for carrying said needle laterally out of one working position and reversely into the other Working position, a support for the other needle having movements in a direct line from one Working position to the other, and means for operating said supports.

2. In a sewing-machine, the combination of needle-operating and feed-operating mechanisms, two needles mounted independently of each other and independently movable laterally relatively to each other and located in a line transversely of the feed-line and at a suitable distance apart and each having its individual thread, means to cause said needles to automatically exchangeplaceswith each other while in the operation of sewing without turning the needles and means for binding the needle-thread loops, one of the needle-carrying bars being connected with the drivingshaft for being operated, and said bar having a forked driver engaging a grooved collar on the other needle-bar for driving it, said fork and collar being slidably connected with each other to automatically accommodate the lateral translatory exchanging movements of the needles.

Signed at New York city this 29th day of October, 1901. HERMANN A. KLEMM.

Vitnesses:

G. SEDeWIoK, J. M. HOWARD, 

